6991532228231 has 8 divisors (see below), whose sum is σ = 7297979161824. Its totient is φ = 6685290900640.

The previous prime is 6991532228221. The next prime is 6991532228249. The reversal of 6991532228231 is 1328222351996.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6991532228231 - 2¹⁸ = 6991531966087 is a prime.

It is a super-2 number, since 2×6991532228231² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991532228221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51332000 + ... + 51468021.

It is an arithmetic number, because the mean of its divisors is an integer number (912247395228).

Almost surely, 2^{6991532228231} is an apocalyptic number.

6991532228231 is a deficient number, since it is larger than the sum of its proper divisors (306446933593).

6991532228231 is a wasteful number, since it uses less digits than its factorization.

6991532228231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102803001.

The product of its digits is 2799360, while the sum is 53.

The spelling of 6991532228231 in words is "six trillion, nine hundred ninety-one billion, five hundred thirty-two million, two hundred twenty-eight thousand, two hundred thirty-one".